Add a libcap target to link against libcap2.

build/linux/system.gyp

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'conditions': [
       ['sysroot!=""', {
         'pkg-config': './pkg-config-wrapper "<(sysroot)" "<(target_arch)"',
       }, {
@@ skipping 459 matching lines @@
                      'brlapi__leaveTtyMode',
                      'brlapi__writeDots',
                      'brlapi__readKey',
           ],
           'message': 'Generating libbrlapi library loader.',
           'process_outputs_as_sources': 1,
         },
       ],
     },
     {
+      'target_name': 'libcap',
+      'type': 'none',
+      'link_settings': {
+        'libraries': [
+          '-lcap',
+        ],
+      },
+    },
+    {
       'target_name': 'libgcrypt',
       'type': 'none',
       'conditions': [
         ['_toolset=="target" and use_cups==1', {
           'direct_dependent_settings': {
             'cflags': [
               '<!@(libgcrypt-config --cflags)',
             ],
           },
           'link_settings': {
@@ skipping 388 matching lines @@
             ],
             'libraries': [
               '<!@(pkg-config --libs-only-l xrandr)',
             ],
           },
         }],
       ],
     },
   ],
 }